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#1: Initial revision
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2020-11-20T11:41:26Z (about 4 years ago)
Your `a` and `b` are reversed in that equation because that equation corresponds to the tracks `(0..1]` and `[1..)` of [this][0], that are symmetric. The `1 / x` plot is [at least] doubly symmetric. One of those two symmetries is `y = x`. That one's the symmetry axis you are asking about. HTH. [0]: http://en.wikipedia.org/wiki/1/x